Steve & friends are captured by Hydra. They force Steve to sexually service them in order to humiliate/degrade him. What they don't actually know is that he spent a fair amount of time as a kid giving blowjobs in back alleys for rent money, and he just goes back to that place in his head. By which I mean sarcastic teenage punk who knows exactly how good he is with his mouth and has zero shame about doing what he needs to do. (Your choice if the friends are watching or not)